In my opinion, everyone gave you some good answers, especially C.M.
I just also want to point out:
Revelation 5:7-9 He came and received the scroll from the right hand of the one who sat on the throne. When he took it, the four living creatures and the twenty-four elders fell down before the Lamb. Each of the elders held a harp and gold bowls filled with incense, which are the prayers of the holy ones. They sang a new hymn: "Worthy are you to receive the scroll and to break open its seals, for you were slain and with your blood you purchased for God those from every tribe and tongue, people and nation. (NAB)
And
**Revelation 8:3-4 ** Another angel came and stood at the altar, 3 holding a gold censer. He was given a great quantity of incense to offer, along with the prayers of all the holy ones, on the gold altar that was before the throne. The smoke of the incense along with the prayers of the holy ones went up before God from the hand of the angel. (NAB)
Question: Who are the elders?
Answer: My interpretation of the passage is that the elders are the Saints in Heaven.
Question: Are there more then 24 Saints in heaven?
Answer: Yes, there are. 24 has a specially meaning, I personally do not know the specially meaning. (I still have to work on that). However I do know that numbers have special meaning:
Examples:
3- everything perfect. “Jesus rising on the 3rd day”
7- makes everything complete. “7 days of creation”
12- universal completeness. If you have 12 of anything you have all of it. --12 tribes of Israel.
24 is double 12… so maybe they are connected. I don’t know.
Also if they want to take the number 24 literally then you have to ask about the 144,000 is that number literal???
Question: Who are the Holy Ones?
**Answer: ** My interpretation is they are the people of God here on Earth. i.e. you and me.
Question: How did the Angels and the Elders receive the prayers of the holy ones??
Answer: The holy ones (the people on Earth) must of ask the Elders (Saints) and Angels to give their prayers to God. After all God is not going to hand them to the Elders (Saints) and Angels only for them to give them back to God. Once God receives a prayer He “keeps” it right???